GLY 102 Lecture Notes - Lecture 9: Thermohaline Circulation, Jakobshavn Glacier, Ablation Zone
19 Apr 2018
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Gravity anomalies: determines change in mass over time. Ice shelf floati(cid:374)g i(cid:272)e, i(cid:272)e(cid:271)erg, (cid:374)ot sea i(cid:272)e, they"re i(cid:374)stead thi(cid:272)k: up to (cid:1005)(cid:1004)(cid:1004)(cid:1004)ft. Mass balance: currency balance: glaciers are striking the balance between the ins (the snow) and parts that experience net ice loss. Areas that gain are called the accumulation zone. Mostly this is winter snowfall that does(cid:374)"t (cid:373)elt the following summer. Ablation zone lower elevation, where you lose the mass. You can lose it from the melting the ice or calving. The mass balance of an ice sheet: same as for a glacier, but the geometry is different. In antarctica: the surface of the ice sheet never physically melts. The only way to lose ice in antarctica is calving. Therefore there is an element to glacier calving that is independent of climate change: chasing. This is (cid:272)alled the (cid:862)dy(cid:374)a(cid:373)i(cid:272)(cid:863) (cid:272)o(cid:373)po(cid:374)e(cid:374)t of i(cid:272)e sheet (cid:272)ha(cid:374)ge. Climate is the forcing, dynamic is the feedback.
